main.js

SubsetType.Collection = Backbone.Collection.extend({
  urlRoot: '/api/subsetType',
  model: SubsetType.Model,

  initialize: function () {
    if (!SubsetType.subsetTypes) {
      SubsetType.subsetTypes = this;
    } else {
      this.models = SubsetTypes.subsetTypes.models;
    }
  }
});